you are correct, the URL cienciaspuras.com is not listed in the Trustesource Database. So you normally would expect that it won't be blocked.
By default MWG has enabled the URL Filter option "Do a forward DNS lookup to rate URLs", which you can find under Policy -> Settings -> Engines -> URL Filter.
This means that MWG will not only query the domain name, but also the IP Address of the server, in this case 220.127.116.11.
If you do a Trusted Source Lookup for http://18.104.22.168 you receive:
URL Status Categorization Reputation http://22.214.171.124 Categorized URL - Pornography Minimal Risk
That's the reason why this URL is blocked. You can whitelist the domain for URL Filtering or disable the forward DNS lookup if you still want to allow access to that site.
Thank you very much Dirk. you are right, if I disable the DNS forward lookup everything works fine. The whitelisting solution does not help me as our users mostly access to uncategorized pages. I have another question, what would be the reason why a domain is not categorized as such, but the ip of the domain is?, I guess that will come from other possible services are being provided from that IP.
I have another question, what would be the reason why a domain is not categorized as such, but the ip of the domain is?, I guess that will come from other possible services are being provided from that IP.
There could be several reasons why the IP is listed, but the domain name is not:
- Other content on the webserver that was categorized by trusted source. Probably still available.
- Shared webhosting service. One webserver can host multiple domains. So multiple websites are on the same server with the same IP. The webserver controls the content based on the incoming request. Often just requesting such a site with the IP Address only will display a template or will not show any content at all, so this is often not an issue. It depends on the webspace provider and the configuration of the web service.
- The IP Address was assigned to a different server before, which hosted content leading to the categorization.
It's hard to tell what the real reason was.